Laminated ZrB2–SiC ceramic with improved strength and toughness

Mechanical and ablation properties of laminated ZrB2–SiC/BN ceramics

“…In recent years, many researchers have been focused on the mechanical properties of laminated ZrB 2 -SiC ceramics [23][24][25][26]. However, ablation behaviors of laminated ZrB 2 -SiC ceramics have been rarely investigated.…”

In situ formation of ZrB2–ZrO2 ultra-high-temperature ceramic composites from high-energy ball-milled ZrB2 powders

“…However, ductile Nb and Mo metal particles have also been added to ZrB 2 [8,9], which has been observed to favour crack deflection and branching as well as to promote stress relaxation near the crack tip [8]. The incorporation of high aspect ratio reinforcements, such as carbon fibres [10,11] and nanotubes [12], graphite flakes [13][14][15][16], and SiC whiskers [17][18][19][20], fibres [17,18], or platelets [21] further reduces the brittleness of the ZrB 2 -based composites, which is attributed to the combination of debonding, pull-out, and bridging of these reinforcements as well as enhanced crack deflection and crack pinning. Finally, another interesting strategy lies in dispersing within the ZrB 2 matrix a second phase with phase-transformation capability, such as ZrO 2 [22][23][24][25][26].…”

Spherical indentation with multiple partial unloading for assessing the mechanical properties of ZrB2–SiC composites

“…This is due to BNNTs and BNNPs exhibit much smaller coefficient of thermal expansion (CTE) values than those of ZrB 2 ($ 6.7 Â 10 À 6 K À 1 ) and SiC ($ 4.3 Â 10 À 6 K À 1 ) [27], respectively. Moreover, theoretical analysis has shown the highly localized residual stresses in the vicinity of these nanofillers would be larger enough to create the dislocations [28,29].…”